Xtool IK618 User Manual page 41

※NOTE: In the process of diagnosis, if the device shows "System is OK"
or "No Trouble Code", it means there is no related trouble code stored
in ECU or some troubles are not under the control of ECU, most of these
troubles are mechanical system troubles or executive circuit troubles, it
is also possible that signal of the sensor may bias within limits, which
can be judged in Live Data.
⚫
CLEAR TROUBLE CODE
It allows clearing current and historical trouble codes memory in ECU,
under the premise that all the troubles are eliminated.
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